Lock nut and method of making



. the device illustratedinl 'la'. 8

ing it will thcbase Patented NOV- 3 UNITED STATES PATENT OFFICE2,300,019 LOCK NUT AND METHOD or MAKING Plummer E. Double, Detroit,Mich. Application December 20, 1941, Serial No. 423,715 4 Claims. (Cl.iii-st) This invention relates broadly to fastening devices and hasparticular reference to a lock nut and the method of making it.

In the aviation industry there is a great demean for fastening devices,which are light in weight, yet durable, and which can be easilyinstalled, and when once in position will not become loosened byexcessive vibration.

It is to such a directed.

The invention resides in the novel construction oi the device and in themethod of producing the same, as hereinafter described and illustratedin the accompanying drawing wherein:

Fig. 1 is a perspective view oi the two elements which go to make up myimproved device.

Fig. 2 is a plan view of a completed nut emmy invention.

Fig. 3 is a side view, partly in section, of the de ce illustrated inFig. 2.

Fig. 4 is a plan view oi a modified form of nut.

Fig. 5 is a side view, partly in section, of the nut iihutrated in Fig.4.

Fig. 6 is a plan view of another modification oi the device.

Fig. 7 is a side elevation, partly in section, of

Referring now more particularly to the drawbe understood that in theembodiment herein disclosed my improved device consists principally, ofa collar 0, and an apertured base or flange member II, which are securedtogether by we] Although I do not propose to be limited in practice toany particular type or welding, I prefer to use a "col in which the heatis confined nary welding operations.

In order to conserve metal I prefer to make the collars I from speciallydrawn or extruded stock, andthebases ll iromspecialbarstock,sothat avery minimum of work is required. A further advantage 01' this methodmetal, whereas the primary function of the base It is simply to hold thenut in position, so that a leestsexpensive metal can be employed withequal resul The collar I can be threaded before or after being welded tothe base I I, although I prefer to weld the parts together before taping. so that l0 may be initially utilised to hold the device that thisdisclosure is consists of providing 'one 01' said device against turningwhile in the tapping ma-- chine. The base I. may or may not be threadeddepending upon the use to which it is to be applied. In Figs. 4 and 5,the base I0 is threaded whereas in the other views only the collar 8 isprovided with threads.

After the parts 8 and III are welded together as hereinabove described,the collar 8 is slotted as at H, and the upper ends II of the collar areinwardly displaced as shown by the dotted lines, to provide a grippingor locking action when a bolt is inserted. A. locking action may also beeflected by distorting the thread area by other means. I

In Figs. 4 and 5, I illustrate a modified form in which the base it ishexagonal in shape and much thicker than is normally required. In thisembodlment the base II is provided with threads as at His.

In Figs. 6 and 7, I illustrate another modified form in which the baseII is in the form of a clip for attaching to another element.

Although I have illustrated and described herein certain embodiments oimy invention, it will be understood that certain other modifications canbe made all of which are intended to be within the scope oi the appendedclaims.

Having described my invention what I claim and desire to protect byLetters Patent is:

1. The method 01' forming a lock nut, which consists oi cutting a lengthof preformed hollow stock, cutting a length of flat bar stock,aperturing the bar stock with a diameter corresponding to thediameteroi' the hollow stock, welding the two together, tapping thehollow stock and then distorting the thread area of the hollow stock.

2. The method defined in claim 1, in which the hollow stock is slottedbefore the thread area is distorted. I

3. The method of forming a lock nut which two lengths of apertured metalhaving diii'erent characteristics of configuration, welding the twolengths or metal together, tapping the aperture oi at least one of saidlengths, slotting the tapped length and then distorting part oi thethread area of said tapped length.

4. The method 01' forming a lock nut which consists of proylding twolengths of apertured metal having diiterent characteristics ofconfiguration and composition, welding the two lengths of metaltogether, so their apertures are in alignment, tapping the aperture ofat least lengths, slotting the tapped length part of the thread area ofPLUMMER E. DOUBLE- and then saidtapped nsth.

